Why Sandisk Stock Suddenly Crashed Today

Source The Motley Fool

Key Points

  • South Korea's stock market just blew up on worries over leveraged bets on Samsung and SK Hynix.

  • Single-stock leveraged ETFs track Sandisk, too.

  • Is Sandisk next to fall?

  • These 10 stocks could mint the next wave of millionaires ›

Did the AI memory chip bubble just burst? Shares of memory specialist Sandisk (NASDAQ: SNDK) imploded Tuesday morning, falling 11% through 10:35 a.m. ET. And you can trace the origins of this sell-off straight to one place:

South Korea.

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Map of Korea under a magnifying glass.

Image source: Getty Images.

Big trouble in little Korea

Home to computer memory giants Samsung and SK Hynix, South Korea is the epicenter of money-making in the memory market. Problem is, gigantic profits earned on memory stocks this year have created a Korean stock market bubble, and it may have just popped.

Korea's Financial Supervisory Service (FSS) approved the creation of 16 "single-stock leveraged ETFs" in late May, all of which track Samsung and SK Hynix with 2x leveraged bets on the stocks' performance. When Samsung stock, for example, gains 1%, the ETF that tracks it should gain 2% -- but when Samsung loses 1%, the losses would be magnified just as much.

Think that might make the stock market more volatile? Well, that's exactly what's happening today -- but it's happening with the best intentions.

FSS Governor Lee Chan-jin now states that he wishes he had blocked the creation of these ultra-leveraged ETFs, which have tripled in size to more than $9 billion over the past few weeks, but are "high-risk products" bought primarily by individual investors gambling on market momentum. Today's warning attempted to cool things down -- but ignited a sell-off instead.

What this means for Sandisk

Similar concerns about Sandisk-leveraged ETFs may be adding to this stock's volatility today. More broadly, investors may wonder how much of the momentum that lifted Sandisk stock 4,700% in 52 weeks was investors buying Sandisk as an alternative to Samsung and SK Hynix shares?

If the price rises in Korea were produced artificially -- maybe Sandisk stock didn't deserve all its gains, either?

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*Stock Advisor returns as of June 23, 2026.

Rich Smith has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.

Disclaimer: For information purposes only. Past performance is not indicative of future results.
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